私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

搜索:  
Synthesis of indole-based functional polymers with well-defined structures via a catalyst-free C–N coupling reaction  
Synthesis of indole-based functional polymers with well-defined structures via a catalyst-free C–N coupling reaction
資料類型: PDF文件
關(guān)鍵詞: Poly(N-arylene  diindolylmethane)s  C–N  coupling  reaction  
資料大?。?/td> 1613k
所屬學(xué)科: 高分子化學(xué)
來源: 來源網(wǎng)絡(luò)
簡(jiǎn)介:
Poly(N-arylene diindolylmethane)s (PMDINs) with precise structures and high molecular weights (Mw up to 389 200) in high yields (up to 95%) were synthesized by the catalyst-free nucleophilic substitution polycondensation of 3,30-diindolylmethane with different activated difluoro monomers via a C–N coupling reaction process. A model reaction was carried out to assist in determining the optimal reaction conditions for the polymerization and to elucidate the chemical structures of the polymers. The resulting polymers exhibited good thermal stability with high decomposition temperature (T5% $ 377 C). Fluorescent spectral studies indicated that all these PMDINs had strong solid-state fluorescence. Especially, the polymer PMDIN-3 carrying sulfonyl units was a good blue-light emitter with high quantum yields (21.6%, determined against quinine sulfate). The results obtained by cyclic voltammetry suggested that PMDINs possessed good electroactivity. In addition, owing to the electrochemical activity of the indole rings at the 2-position, PMDIN-3 was readily cross-linked by electrochemical oxidation and the cross-linking film was characterized by scanning electron microscopy. High molecular weights and good comprehensive performance of the indole-based polymers suggested that the catalyst-free C–N coupling reaction of indole derivatives with difluoro monomers could be considered as an effective polymerization route for the synthesis of new functional polymers with well-defined structures.
上傳人: changguanjun
上傳時(shí)間: 2017-02-08 13:39:25
下載次數(shù): 0
消耗積分: 0  
立即下載:
1人
1人
1人
友情提示:下載后對(duì)該資源進(jìn)行評(píng)論,即可獎(jiǎng)勵(lì)2分。
報(bào)告錯(cuò)誤:  1.下載無效  2. 資料明顯無價(jià)值  3. 資料重復(fù)存在

相關(guān)評(píng)論 共有0人發(fā)表評(píng)論 更多評(píng)論
你還沒有登錄,無法發(fā)表評(píng)論,請(qǐng)首先 登錄 注冊(cè)
免責(zé)聲明:本站部分資源由網(wǎng)友推薦,來自互聯(lián)網(wǎng),版權(quán)屬于原版權(quán)人,如果不慎侵犯到您的權(quán)利,敬請(qǐng)告知,我們會(huì)在第一時(shí)間撤除。本站中各網(wǎng)友的評(píng)論只代表其個(gè)人觀點(diǎn),不代表本站同意其觀點(diǎn)。
主站蜘蛛池模板: 景洪市| 山阳县| 古浪县| 金平| 大埔县| 双桥区| 平定县| 高台县| 铜川市| 紫云| 乌拉特前旗| 前郭尔| 富平县| 交城县| 互助| 得荣县| 桓台县| 抚远县| 和田市| 嵊泗县| 江津市| 重庆市| 连南| 信宜市| 出国| 西乌| 离岛区| 石景山区| 抚顺县| 徐闻县| 昭觉县| 开江县| 鹤山市| 巴林右旗| 台北县| 临洮县| 凭祥市| 靖边县| 安多县| 洪湖市| 博客|